CMOS low-distortion low-noise amplifier circuit

Abstract

The invention discloses a CMOS low-distortion low-noise amplifier circuit, which is applied to the field of radio frequency integrated circuits, and aims to solve the problems that the third-order intermodulation linearity of an amplifier circuit in the prior art is below 0dBm, and a large signal interference environment is difficult to deal with. The transconductance input stage adopts a complementary common-source stage structure, so that the current efficiency is doubled; the linearity improving stage adopts a complementary common-emitter stage to improve the small signal linearity of the complementary common-source stage; the feedback stage adopts a source follower to solve the second-order interaction problem of nonlinear active feedback; an off-chip element and an input parasitic capacitor form a [pi]-type matching network to enhance the input matching bandwidth, so that an on-chip high-capacity inductor is prevented from being used; and the common-mode feedback circuit detects common-mode voltage of an output port of the low-noise amplifier circuit and compares the common-mode voltage with a reference voltage, and an obtained error signal is in feedback connection with gridsof the Mp1 and the Mp2 through a bias resistor for dynamic adjustment, so that the circuit works at a stable direct-current working point.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, in particular to a low noise amplifier circuit. Background technique [0002] At present, software wireless terminal technology is becoming more and more popular. It only needs to be configured at the baseband software protocol layer, and various standards that meet the requirements of different communication protocols can be flexibly compatible with each other and coexist on a set of hardware equipment platforms. Therefore, the research on broadband radio frequency transceiver technology is becoming more and more important. Compared with the traditional bloated transceiver structure, the new SAW (surface acoustic wave) filter-free transceiver structure proposed in recent years has quickly become the focus of the industry. In order to obtain good anti-jamming ability, the non-SAW receiver design abandons the traditional voltage mode and adopts a novel current mode design concep...

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Problems solved by technology

In addition, the literature (Guo Benqing, A 8.1mW 0.1~2GHz inductorless CMOS LNTA for software-defined radio applications, IEEE ASICON, 1-4, 2015) proposed an innovative ...

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